Electrical heating element for fluid media

Abstract

A heating element (for a hair dryer, fan heater or other electrical appliance) in which the turns of resistance heating wire are held in place, in edge recesses of support plate means, by a strip of heat-resistant cement applied to the supporting edges and over the turns of the wire. The cement is non-wetting with respect to the heating wire.

What is claimed is: 
     
       1. Electrical heating element for fluid and more particularly gaseous media, comprising a support plate means of insulating material having supporting edges with recesses formed therein, a resistance heating wire wound about the support means in a manner so as to be supported within the recesses and a layer of heat-resistant cement that is non-wetting with respect to the material of said heating wire applied to said support means so as only to overlie the resistance wire in a region of said edges and so as to extend into said recesses at most to a minor extent, whereby said cement forms, in the vicinity of the recesses, bridges having minimal physical contact with said resistance wire and prejudicial affects on heat dissipation are minimized. 
     
     
       2. Heating element according to claim 1, wherein the width of the applied cement layer corresponds substantially to the thickness of the support plate means. 
     
     
       3. Heating element according to claim 1, wherein the width of the applied cement layer corresponds substantially to the length of heating wire portions engaging over a respective one of the supporting edges. 
     
     
       4. Heating element according to claim 1, wherein the applied cement layer does not extend beyond the heating wire into the edge recesses.